HDCP.cpp revision ec3acca4a75fc4adc076b56751124f507b419622 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "HDCP"
19#include <utils/Log.h>
20
21#include "HDCP.h"
22
23#include <media/stagefright/foundation/ADebug.h>
24
25#include <dlfcn.h>
26
27namespace android {
28
29HDCP::HDCP(bool createEncryptionModule)
30    : mIsEncryptionModule(createEncryptionModule),
31      mLibHandle(NULL),
32      mHDCPModule(NULL) {
33    mLibHandle = dlopen("libstagefright_hdcp.so", RTLD_NOW);
34
35    if (mLibHandle == NULL) {
36        ALOGE("Unable to locate libstagefright_hdcp.so");
37        return;
38    }
39
40    typedef HDCPModule *(*CreateHDCPModuleFunc)(
41            void *, HDCPModule::ObserverFunc);
42
43    CreateHDCPModuleFunc createHDCPModule =
44        mIsEncryptionModule
45            ? (CreateHDCPModuleFunc)dlsym(mLibHandle, "createHDCPModule")
46            : (CreateHDCPModuleFunc)dlsym(
47                    mLibHandle, "createHDCPModuleForDecryption");
48
49    if (createHDCPModule == NULL) {
50        ALOGE("Unable to find symbol 'createHDCPModule'.");
51    } else if ((mHDCPModule = createHDCPModule(
52                    this, &HDCP::ObserveWrapper)) == NULL) {
53        ALOGE("createHDCPModule failed.");
54    }
55}
56
57HDCP::~HDCP() {
58    Mutex::Autolock autoLock(mLock);
59
60    if (mHDCPModule != NULL) {
61        delete mHDCPModule;
62        mHDCPModule = NULL;
63    }
64
65    if (mLibHandle != NULL) {
66        dlclose(mLibHandle);
67        mLibHandle = NULL;
68    }
69}
70
71status_t HDCP::setObserver(const sp<IHDCPObserver> &observer) {
72    Mutex::Autolock autoLock(mLock);
73
74    if (mHDCPModule == NULL) {
75        return NO_INIT;
76    }
77
78    mObserver = observer;
79
80    return OK;
81}
82
83status_t HDCP::initAsync(const char *host, unsigned port) {
84    Mutex::Autolock autoLock(mLock);
85
86    if (mHDCPModule == NULL) {
87        return NO_INIT;
88    }
89
90    return mHDCPModule->initAsync(host, port);
91}
92
93status_t HDCP::shutdownAsync() {
94    Mutex::Autolock autoLock(mLock);
95
96    if (mHDCPModule == NULL) {
97        return NO_INIT;
98    }
99
100    return mHDCPModule->shutdownAsync();
101}
102
103uint32_t HDCP::getCaps() {
104    Mutex::Autolock autoLock(mLock);
105
106    if (mHDCPModule == NULL) {
107        return NO_INIT;
108    }
109
110    // TO-DO:
111    // Only support HDCP_CAPS_ENCRYPT (byte-array to byte-array) for now.
112    // use mHDCPModule->getCaps() when the HDCP libraries get updated.
113    //return mHDCPModule->getCaps();
114    return HDCPModule::HDCP_CAPS_ENCRYPT;
115}
116
117status_t HDCP::encrypt(
118        const void *inData, size_t size, uint32_t streamCTR,
119        uint64_t *outInputCTR, void *outData) {
120    Mutex::Autolock autoLock(mLock);
121
122    CHECK(mIsEncryptionModule);
123
124    if (mHDCPModule == NULL) {
125        *outInputCTR = 0;
126
127        return NO_INIT;
128    }
129
130    return mHDCPModule->encrypt(inData, size, streamCTR, outInputCTR, outData);
131}
132
133status_t HDCP::encryptNative(
134        const sp<GraphicBuffer> &graphicBuffer,
135        size_t offset, size_t size, uint32_t streamCTR,
136        uint64_t *outInputCTR, void *outData) {
137    Mutex::Autolock autoLock(mLock);
138
139    CHECK(mIsEncryptionModule);
140
141    if (mHDCPModule == NULL) {
142        *outInputCTR = 0;
143
144        return NO_INIT;
145    }
146
147    return mHDCPModule->encryptNative(graphicBuffer->handle,
148                    offset, size, streamCTR, outInputCTR, outData);
149}
150
151status_t HDCP::decrypt(
152        const void *inData, size_t size,
153        uint32_t streamCTR, uint64_t outInputCTR, void *outData) {
154    Mutex::Autolock autoLock(mLock);
155
156    CHECK(!mIsEncryptionModule);
157
158    if (mHDCPModule == NULL) {
159        return NO_INIT;
160    }
161
162    return mHDCPModule->decrypt(inData, size, streamCTR, outInputCTR, outData);
163}
164
165// static
166void HDCP::ObserveWrapper(void *me, int msg, int ext1, int ext2) {
167    static_cast<HDCP *>(me)->observe(msg, ext1, ext2);
168}
169
170void HDCP::observe(int msg, int ext1, int ext2) {
171    Mutex::Autolock autoLock(mLock);
172
173    if (mObserver != NULL) {
174        mObserver->notify(msg, ext1, ext2, NULL /* obj */);
175    }
176}
177
178}  // namespace android
179
180